CVE-2016-10619 in pennyworth
Summary
by MITRE
pennyworth is a natural language templating engine. pennyworth downloads data resources over HTTP, which leaves it vulnerable to MITM attacks.
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Analysis
by VulDB Data Team • 02/11/2020
CVE-2016-10619 represents a significant security vulnerability in pennyworth, a natural language templating engine that processes and generates text content through template-based approaches. This vulnerability stems from the engine's reliance on unencrypted HTTP protocols for downloading data resources, creating a fundamental weakness in the system's security architecture. The flaw exposes the templating engine to man-in-the-middle attacks where malicious actors can intercept and potentially modify data transfers between the engine and its remote resources. This vulnerability directly relates to CWE-319, which specifically addresses the exposure of sensitive information through improper use of network protocols. The security implications extend beyond simple data interception, as attackers could inject malicious content into the template processing pipeline, potentially leading to arbitrary code execution or data corruption within the templating system.
The technical implementation of this vulnerability demonstrates a critical design flaw in the resource management subsystem of pennyworth. When the templating engine attempts to fetch external data resources, it defaults to using HTTP instead of secure HTTPS connections, creating an attack surface that adversaries can exploit. This weakness is particularly concerning because templating engines often process sensitive data and user inputs, making them attractive targets for attackers seeking to compromise the underlying system. The vulnerability operates at the network communication layer, where the absence of proper encryption protocols allows for packet sniffing and traffic manipulation. Attackers can leverage this weakness by positioning themselves between the engine and its data sources to perform session hijacking, data injection, or content tampering operations. The lack of transport layer security in the communication channel violates fundamental security principles and creates opportunities for various attack vectors described in the ATT&CK framework under T1041, which covers data from network shared drives.
The operational impact of CVE-2016-10619 extends beyond immediate security concerns to affect the integrity and confidentiality of template processing workflows. Organizations relying on pennyworth for content generation, automated reporting, or dynamic text manipulation face potential exposure of sensitive information through intercepted communications. The vulnerability becomes particularly dangerous when the templating engine processes user-generated content or personal identifiable information, as attackers could potentially access or modify this data during transit. System administrators may experience unauthorized modifications to template resources, leading to incorrect output generation or potential service disruption. The attack surface is further expanded when considering that many templating engines integrate with databases, external APIs, or other network services, creating cascading security implications. This vulnerability essentially undermines the trust model of the templating system, as users cannot guarantee that the data they are processing comes from legitimate sources. The exploitation of this weakness can result in data breaches, content injection attacks, or even full system compromise if the templating engine's processing logic is vulnerable to malicious input manipulation.
Mitigation strategies for CVE-2016-10619 must address both immediate remediation and long-term architectural improvements to prevent similar vulnerabilities in the templating engine's communication protocols. Organizations should immediately implement mandatory HTTPS usage for all external resource downloads, ensuring that the templating engine enforces secure transport protocols. The system should be configured to reject HTTP connections or automatically redirect them to secure HTTPS endpoints, preventing accidental use of insecure protocols. Network administrators should implement strict firewall policies that block unencrypted HTTP traffic to the templating engine's resource endpoints, while also deploying certificate validation mechanisms to ensure proper SSL/TLS implementation. Security patches should be applied to update the pennyworth engine to versions that properly enforce secure communication channels, and organizations should conduct comprehensive network audits to identify any other systems using similar insecure communication patterns. Additionally, implementing network monitoring solutions that detect and alert on HTTP traffic to external resources can provide early warning capabilities for potential exploitation attempts. The remediation process should also include security awareness training for developers who might inadvertently configure the templating engine to use insecure protocols, ensuring that secure coding practices are maintained throughout the development lifecycle. Organizations should consider implementing a zero-trust network architecture approach where all communications are verified and encrypted, aligning with industry best practices for secure software development and deployment.